Orange

Hendrik Vorwerk

Pierrick Philippe

A method for decoding a data signal representative of at least one image cut into blocks. The method includes, for a current block to be decoded: transforming a residual data block obtained from the data signal; determining a permutation-transformation pair including a transformation mathematical operation and a permutation mathematical operation, the transformation mathematical operation and the permutation mathematical operation belonging to respectively a plurality of permutation operations and a plurality of transformation operations; applying the determined transformation mathematical operation to the data of the residual data block to produce transformed data; applying the determined permutation mathematical operation to the transformed data to produce permuted data, the determined permutation mathematical operation being an operation of transposing the transformed data; and using the permuted data to reconstruct the current block by a predictive decoding.

Method for encoding and decoding images, device for encoding and decoding images and corresponding computer programs

A method is provided for encoding at least one image cut into blocks. The method implements, for a current block to be encoded, the acts of: predicting the current block with the aid of at least one predictor block, determining a residual data block representative of the difference between the predictor block and the current block, selecting, according to a predetermined criterion, a pair of mathematical operations including a permutation operation and a transformation operation from among a plurality of permutation operations, and a plurality of transformation operations, applying the permutation operation of said selected pair to the data of the determined residual block, applying the transformation operation of said selected pair to the permuted data, and encoding the data from said applied transformation operation.

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Munster, Germany

Hendrik Vorwerk